JP3209873B2 - Ground improvement equipment - Google Patents
Ground improvement equipmentInfo
- Publication number
- JP3209873B2 JP3209873B2 JP04202995A JP4202995A JP3209873B2 JP 3209873 B2 JP3209873 B2 JP 3209873B2 JP 04202995 A JP04202995 A JP 04202995A JP 4202995 A JP4202995 A JP 4202995A JP 3209873 B2 JP3209873 B2 JP 3209873B2
- Authority
- JP
- Japan
- Prior art keywords
- blade
- stirring
- tip
- excavation
- excavating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Earth Drilling (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、固化材と土砂とを現位
置で攪拌・混合することにより地盤中に固化改良体を造
成する混合処理工法に用いられる地盤改良装置に係り、
特に詳しくはその攪拌ロッド構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement apparatus used in a mixing method for forming a solidified body in a ground by stirring and mixing a solidified material and earth and sand at a current position.
More particularly, it relates to the stirring rod structure.
【0002】[0002]
【従来の技術】たとえば、埋立地等の地盤改良、道路・
土地造成工事における地盤改良などにおいては、主とし
て石灰やセメント系の化学的固化材を土に添加し強制的
に攪拌・混合することにより固化させ地盤強度を高め
る、混合処理工法がその有用性から多く採用されてい
る。2. Description of the Related Art For example, ground improvement of landfills, roads,
For soil improvement in land reclamation work, mixing method is mainly used to increase the soil strength by adding lime or cement-based chemical solidification material to the soil and solidifying it by forcible stirring and mixing. Has been adopted.
【0003】前記混合処理工法は、改良地盤の形状、強
度に比較的自由性があり、水深条件や地盤条件等の異な
る様々な地盤に適用でき、しかも経済的であり、また地
盤中に加えるセメントスラリーの量が少なく、これに伴
う盛上り土量も少ないため、既設構造物に対する影響が
少ない、さらに施工中の振動、騒音が少ないため、都市
部の地盤改良に適した工法であるなど種々の利点を有す
る。[0003] The above-mentioned mixed treatment method is relatively flexible in the shape and strength of the improved ground, can be applied to various grounds having different water depth conditions and ground conditions, and is economical. Since the amount of slurry is small and the amount of embankment associated with it is small, it has little effect on existing structures.Moreover, since there is little vibration and noise during construction, it is a construction method suitable for ground improvement in urban areas. Has advantages.
【0004】前記混合処理工法に用いられる地盤改良装
置の攪拌翼構造を図7に基づいて説明すると、攪拌ロッ
ド1には、掘削と固化材との混合のために、その先端部
に掘削刃28と攪拌翼29とが設けられている。前記掘
削刃28は、掘削機能と攪拌機能を有していなければな
らないため、その最先端部に回転径の小さい先端掘削刃
31と、これの上方側に離間して配置された、回転径の
大きな攪拌兼用掘削刃30とから構成されている。この
場合、前記攪拌兼用掘削刃30は、攪拌翼としての機能
を合わせ持つようにロッドを中心として対称的に配置さ
れた左側翼30aと右側翼30bとによりトンボ羽根状
に形成されているものが一般的である。Referring to FIG. 7, the structure of the stirring blade of the ground improvement apparatus used in the mixing method will be described. The stirring rod 1 is provided with a cutting blade 28 at the tip thereof for excavation and mixing with the solidified material. And a stirring blade 29 are provided. Said digging
Cutting blade 28, since it must have a drilling function and a stirring function, a small tip digging edge 31 of rotating diameter to that leading edge portion, which is spaced to the upper side, it the size of the rotation diameter And a stirring / excavating blade 30. In this case, the stirring / excavating blade 30 is formed in a dragonfly blade shape by a left wing 30a and a right wing 30b symmetrically arranged around a rod so as to have a function as a stirring blade. General.
【0005】また、前記左・右側翼30a、30bは、
それぞれに付設されたビット32、32…が地盤に対し
て所定角度で進入するように所定角度だけ傾斜させて取
り付けられている。The left and right wings 30a, 30b are
Are attached at a predetermined angle so that the bits 32, 32,... Attached to them respectively enter the ground at a predetermined angle.
【0006】[0006]
【発明が解決しようとする課題】しかしながら、前述し
た攪拌ロッドの場合には、先端掘削刃31とその上側に
配置された攪拌兼用掘削刃30とが離間して配置されて
いるため、先端掘削刃31で掘削された掘削土が上方に
掻き上げらず、先端掘削刃31と攪拌兼用掘削刃30と
の間に一時的に滞留してしまい掘削効率を低下させるな
どの問題が発生していた。このような問題は、掘削地盤
が粘性土や腐食土などの軟弱地盤や、掘削地盤が「レ
キ」や「砂レキ」などの硬い地盤であっても改良径が小
さい場合には顕著に現れないが、攪拌兼用掘削刃30の
回転径を非常に大きくした場合や、対象地盤の上層部に
改良が不要な「レキ」や「砂レキ」などの硬い地盤層が
あり、その下層部に改良対象となる「粘性土」や「腐食
土」などの軟弱地盤層がある施工条件の下で、上部側の
硬い地盤層を空掘りしなければならない場合には非常に
顕著に現れる。However, in the case of the stirring rod described above, the tip excavation blade 31 and the stirring / excavation blade 30 arranged above the tip excavation blade 31 are spaced apart from each other. The excavated soil excavated at 31 does not rise upward, but temporarily stays between the tip excavating blade 31 and the agitating / excavating blade 30 to cause a problem that the excavating efficiency is reduced. Such problems do not appear remarkably when the excavated ground is soft ground such as cohesive soil or corroded soil, or when the excavated ground is hard ground such as "Reki" or "Sandreki" and the improved diameter is small. However, when the rotation diameter of the agitating and excavating blade 30 is extremely large, or there is a hard ground layer such as “Reki” or “Sandreki” that does not need to be improved in the upper layer of the target ground, and the lower layer has an object to be improved. It becomes very remarkable when it is necessary to dig a hard ground layer on the upper side under construction conditions where there is a soft ground layer such as "cohesive soil" or "corroded soil".
【0007】そこで、本発明の課題は、攪拌ロッドの先
端で掘削された掘削土を効率良く上方に掻き上げ掘削効
率の低下を招くことのない地盤改良装置を提供すること
にある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a ground improvement apparatus which efficiently excavates excavated soil excavated at the tip of a stirring rod and does not cause a decrease in excavation efficiency.
【0008】[0008]
【課題を解決するための手段】前記課題を解決するため
に本発明は、攪拌ロッドの先端に掘削刃と攪拌翼とが設
けられ、固化材と掘削土とを原位置で攪拌・混合する地
盤改良装置において、前記攪拌ロッドを内管と外管から
なる二重管構造のロッド体とし、これら内管と外管とを
互いに逆方向に回転させるように構成し、前記掘削刃
は、攪拌ロッドの最先端部に設けられた先端掘削刃と、
この先端掘削刃よりやや基端側に離間して設けられると
ともに前記先端掘削刃の回転径以上の回転径とされる攪
拌兼用掘削刃とから構成され、前記先端掘削刃と攪拌兼
用掘削刃とがこれらを繋ぐ螺旋状の連続刃によって連続
一体化されており、前記外管の先端付近の外周に対称的
に設けられた一対の攪拌翼を設け、この攪拌翼に下方に
延び前記攪拌兼用掘削刃と接触しない範囲で長い縦剪断
用補助翼を設けたことを特徴とするものである。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a ground in which a cutting blade and a stirring blade are provided at the tip of a stirring rod, and a solidified material and excavated soil are stirred and mixed in situ. In the improved apparatus, the stirring rod is a rod having a double pipe structure including an inner pipe and an outer pipe, and the inner pipe and the outer pipe are configured to rotate in opposite directions to each other. A cutting edge provided at the forefront of the
The tip excavation blade is provided at a distance slightly closer to the base end side, and includes a stirring / excavation blade having a rotation diameter equal to or larger than the rotation diameter of the tip excavation blade. They are continuously integrated by a spiral continuous blade that connects them, and are symmetrical around the outer circumference near the tip of the outer tube.
Are provided with a pair of agitating blades, and an auxiliary blade for longitudinal shearing is provided to extend downward to the agitating blades and not to be in contact with the agitating and digging blade.
【0009】またその装置例として、前記掘削刃は、ロ
ッドを中心として対称的に設けられた左側掘削刃と右側
掘削刃とからなる先端掘削刃と、この先端掘削刃よりや
や基端側に離間した位置に前記左および右側掘削刃と平
面的に略90°のずれをもってロッドを中心として対称
的に設けられた左側攪拌兼用掘削刃と右側攪拌兼用掘削
刃とからなるとともに、前記先端掘削刃の回転径以上の
回転径とされる攪拌兼用掘削刃とから構成され、前記先
端掘削刃と前記攪拌兼用掘削刃とは、前記左側掘削刃の
上端辺から前記左側攪拌兼用掘削刃の内側下端辺までを
螺旋状に連続させる左側連続刃と、前記右側掘削刃の上
端辺から前記右側攪拌兼用掘削刃の内側下端辺までを螺
旋状に連続させる右側連続刃とによって連続一体化させ
ることができる。Further, as an example of the apparatus, the excavating blade is separated from a distal excavating blade composed of a left excavating blade and a right excavating blade provided symmetrically with respect to a rod, to a position slightly proximal to the distal excavating blade. The left and right excavation blades comprise a left agitating and excavating blade and a right agitating and excavating blade provided symmetrically about the rod with a deviation of approximately 90 ° in plan from the left and right excavating blades. It is composed of a stirring and excavating blade having a rotating diameter equal to or larger than a rotating diameter, and the tip excavating blade and the stirring and excavating blade are arranged from an upper end side of the left excavating blade to an inner lower end side of the left stirring and excavating blade. Can be continuously integrated by a left continuous blade that spirally continues from the upper edge of the right digging blade and a right continuous blade that spirally continues from the upper edge of the right digging blade to the inner lower edge of the right stirring and digging blade.
【0010】さらに、本発明装置においては、前記攪拌
ロッドを内管と外管からなる二重管構造のロッド体と
し、これら内管と外管とを互いに逆方向に回転させ、か
つ前記内管の先端部に先端掘削刃と攪拌兼用掘削刃とよ
りなる掘削刃を設け、前記外管の先端付近の外周に攪拌
翼を設ける構成を採ることにより、共回り現象を抑え、
固化材と掘削土とを効果的に混合・攪拌し、強度的にバ
ラツキのない均一な改良体を得ることができる。Further, in the apparatus of the present invention, the stirring rod is a rod having a double pipe structure comprising an inner pipe and an outer pipe, and the inner pipe and the outer pipe are rotated in opposite directions to each other. Provide a drilling blade consisting of a distal drilling blade and a stirring and drilling blade at the distal end of the outer tube, by adopting a configuration in which a stirring blade is provided on the outer periphery near the distal end of the outer tube, suppressing the co-rotation phenomenon,
The solidified material and the excavated soil can be effectively mixed and stirred, and a uniform improved body having no variation in strength can be obtained.
【0011】[0011]
【作用】本発明においては、先端掘削刃と攪拌兼用掘削
刃とを連続刃によって螺旋状に連続一体化させる。した
がって、先端掘削刃により掘削された掘削土が効率良く
かつ連続して上方に移送されるようになるため、後側の
攪拌兼用掘削刃に過度の負荷力をかけることがなくな
り、地盤を効率的に掘削できるようになる。また、後述
実施例により立証されるように、攪拌兼用掘削刃の回転
径を大きくした場合や硬い地盤を空掘りする場合でも高
い掘削性能を確保することができる。According to the present invention, the tip excavation blade and the agitation / excavation blade are continuously integrated spirally by a continuous blade. Therefore, the excavated soil excavated by the tip excavation blade is efficiently and continuously transferred upward, so that an excessive load force is not applied to the agitating / excavation blade on the rear side, and the ground is efficiently removed. Can be excavated. Further, as will be proved by the examples described later, high excavation performance can be ensured even when the rotation diameter of the stirring and excavating blade is increased or when excavating hard ground.
【0012】[0012]
【実施例】以下、本発明を実施例に基づいて詳述する。
混合処理工法に使用される地盤改良装置は、図1に示さ
れるように、ベースマシン23に対して立設状態で固定
されたリーダー21上に、リーダー21に沿って移動可
能とされるパワースイベル20が搭載され、このパワー
スイベル20に対し減速機を介して攪拌ロッド1が連結
されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments.
As shown in FIG. 1, a ground improvement device used in the mixing processing method includes a power swivel that is movable along the leader 21 on a leader 21 fixed in an upright state with respect to a base machine 23. The power swivel 20 is connected to the stirring rod 1 via a speed reducer.
【0013】前記攪拌ロッド1は、詳細には図2に示さ
れるように、内管7と外管8とからなる二重管構造のロ
ッド体であり、これら内管7と外管8とは前記減速機の
変速機構により、一方が右回りに他方が左回りというよ
うに正逆方向に夫々回転するようになっている。As shown in detail in FIG. 2, the stirring rod 1 is a rod having a double pipe structure comprising an inner pipe 7 and an outer pipe 8, and the inner pipe 7 and the outer pipe 8 are connected to each other. The speed change mechanism of the speed reducer rotates in the forward and reverse directions, such that one rotates clockwise and the other rotates counterclockwise.
【0014】前記攪拌ロッド1の先端部においては、前
記内管7は外管8の先端よりも若干先方に突出して構成
され、内管7の先端部に掘削刃2が設けられている。前
記掘削刃2は、最先端部に固定された先端掘削刃4とこ
の先端掘削刃4の上方側に固定された攪拌兼用掘削刃5
とから構成され、前記先端掘削刃4は内管7を中心にし
て対称的に設けられた一対の左側掘削刃4aと右側掘削
刃4bとからなり、これら両掘削刃4a、4bの下側に
は掘削ビット10が複数設けられている。前記左・右側
掘削刃4a、4bはそれぞれ所定角度だけ傾斜させて形
成されており、掘削ビット10、10…の刃先が地盤に
対し所定の角度で進入するように取り付けてある。この
場合に、前記掘削刃4a、4bの傾斜角度としては、8
0〜95°にするのが望ましい。また、内管7の最先端
部には、固化材吐出口9が形成され、セメント系、石灰
系の粉体または液体の固化材が吐出されるようになって
いる。At the tip of the stirring rod 1, the inner pipe 7 is formed so as to protrude slightly ahead of the tip of the outer pipe 8, and the tip of the inner pipe 7 is provided with a digging blade 2. The digging blade 2 includes a tip digging blade 4 fixed to the foremost portion and a stirring and digging blade 5 fixed above the tip digging blade 4.
The tip excavation blade 4 is composed of a pair of left excavation blades 4a and right excavation blades 4b provided symmetrically with respect to the inner pipe 7, and below the two excavation blades 4a, 4b. Has a plurality of drill bits 10. The left and right excavating blades 4a, 4b are formed so as to be inclined by a predetermined angle, and are mounted so that the cutting edges of the excavating bits 10, 10,... Enter the ground at a predetermined angle. In this case, the inclination angle of the digging blades 4a and 4b is 8
It is desirably 0 to 95 °. A solidified material discharge port 9 is formed at the foremost portion of the inner pipe 7 so that a cement-based or lime-based powder or liquid solidified material is discharged.
【0015】また、前記攪拌兼用掘削刃5も同様に、内
管7を中心にして対称的に設けられた一対の左側攪拌兼
用掘削刃5aと右側攪拌兼用掘削刃5bとからなり、こ
れらの攪拌兼用掘削刃5a、5bは前記左・右側掘削刃
4a、4bの取付け位置に対し平面的に90°ずらした
位置に固定されている。また、攪拌兼用掘削刃5の下側
には、掘削ビット10が複数設けられており、これら左
・右側攪拌兼用掘削刃5a、5bによる掘削径は、ほぼ
後述の攪拌翼3Aと同等とされている。また、攪拌兼用
掘削刃5も前記先端掘削刃4の場合と同様に、それぞれ
所定角度だけ傾斜させて形成されており、先端掘削ビッ
ト10、10…の刃先が地盤に対し所定の角度で進入す
るように取り付けてある。この場合に、前記攪拌兼用掘
削刃5a、5bの傾斜角度としては、40〜50°にす
るのが望ましい。Similarly, the agitating and digging blade 5 also includes a pair of a left and agitating and digging blade 5a and a right agitating and digging blade 5b provided symmetrically with respect to the inner pipe 7. The combined digging blades 5a and 5b are fixed at positions shifted by 90 ° in plan from the mounting positions of the left and right digging blades 4a and 4b. In addition, a plurality of excavating bits 10 are provided below the stirring and excavating blade 5, and the excavation diameter of the left and right stirring and excavating blades 5a and 5b is substantially equal to that of a stirring blade 3A described later. I have. Also, similarly to the case of the tip excavation blade 4, the stirring and excavation blade 5 is also formed to be inclined by a predetermined angle, and the cutting edges of the tip excavation bits 10, 10, ... enter the ground at a predetermined angle. It is attached as follows. In this case, the inclination angle of the stirring and excavating blades 5a and 5b is preferably set to 40 to 50 °.
【0016】また、前記先端掘削刃4と攪拌兼用掘削刃
5とは、これらを繋ぐ連続刃6により螺旋状に連続化さ
れている。前記連続刃6は、図4に示されるように、前
記左側掘削刃4aの上端辺と左側攪拌兼用掘削刃5aの
下端辺とを螺旋状に連続させる左側連続刃6aと、前記
右側掘削刃4bの上端辺と右側攪拌兼用掘削刃5bの下
端辺とを螺旋状に連続させる右側連続刃6bとからな
り、先端掘削刃4によって掘り起こされた土砂が前記連
続刃6によって現位置に滞留することなく連続的に上方
に移動され、さらに攪拌兼用掘削刃5により攪拌される
とともに、先端掘削刃4より外方に位置する部分につい
ては、前記攪拌兼用掘削刃5により最初に掘削が行われ
るようになっている。この場合、前記連続刃6の傾斜角
度としては20〜30°とするのが望ましい。The tip excavation blade 4 and the stirring / excavation blade 5 are helically connected by a continuous blade 6 connecting them. The continuous blade 6, as shown in FIG. 4, a left-side continuous blade 6a for continuous and lower sides of the upper side and the left agitation combined digging edge 5a of the left digging edge 4a in a spiral shape, and the right digging edge becomes 4b and lower sides of the upper side and the right agitation combined digging edge 5b from the right side continuous blade 6b for continuous helically sediment was dug up by the tip digging edge 4 staying in the current position by the continuous blade 6 It is continuously moved upward without being stirred, and is further agitated by the agitating and digging blade 5, and a portion located outside the tip digging blade 4 is excavated first by the agitating and digging blade 5. It has become. In this case, the inclination angle of the continuous blade 6 is desirably set to 20 to 30 °.
【0017】他方、外管8の先端付近には、図示の例で
は上下方向に3段配置により攪拌翼3A〜3Cが設けら
れている。これら各攪拌翼3A〜3Cは、外管8を中心
にして対称的に設けられた一対の攪拌羽根3aと攪拌羽
根3bとからなる。これら攪拌翼3B、3Cの攪拌羽根
3a、3bの上側には掘削ビット10が適宜の位置に設
けられ、攪拌ロッド1の引き下げ時に掘進用として利用
される。また、各攪拌翼3A〜3Cのうち、少なくとも
1つを、図示の例では攪拌翼3Cを他の攪拌翼3A、3
Bよりも短くしている。そうすることにより、軸心側の
攪拌性能を向上させることができるとともに、攪拌ロッ
ド1の引上げ時の抵抗を低減することもできる。また、
前記攪拌羽根3a、3bはそれぞれ所定角度だけ傾斜さ
せて形成されており、掘削ビット10の刃先が地盤に所
定の角度で進入するように取り付けてある。この場合、
前記攪拌羽根3a、3bの傾斜角度としては25〜40
°にするのが望ましい。また、各攪拌翼3A〜3Cは、
平面的に視て90°づつずらして配置されている。前記
攪拌翼は、本例では3段配置の例を示したが、1段配置
であってもよいし、また4段以上配置されることでもよ
い。また、1段当りに形成される攪拌羽根の数もたとえ
ば3翼、4翼とすることもできる。なお、攪拌羽根3
a、3bに取付けられた掘削ビット10を省略すること
もできる。On the other hand, near the end of the outer tube 8, stirring blades 3A to 3C are provided in a vertically arranged three-stage arrangement in the illustrated example. Each of the stirring blades 3A to 3C includes a pair of stirring blades 3a and 3b provided symmetrically with respect to the outer tube 8. Excavation bits 10 are provided at appropriate positions above the stirring blades 3a and 3b of these stirring blades 3B and 3C, and are used for excavation when the stirring rod 1 is lowered. Further, at least one of the stirring blades 3A to 3C, in the illustrated example, the stirring blade 3C is connected to the other stirring blades 3A, 3A, and 3C.
B is shorter than B. By doing so, the stirring performance on the shaft center side can be improved, and the resistance at the time of pulling up the stirring rod 1 can be reduced. Also,
The stirring blades 3a and 3b are formed so as to be inclined by a predetermined angle, and are mounted so that the cutting edge of the drill bit 10 enters the ground at a predetermined angle. in this case,
The inclination angle of the stirring blades 3a, 3b is 25-40.
° is desirable. In addition, each of the stirring blades 3A to 3C is
They are arranged so as to be shifted by 90 ° in plan view. In the present example, the example of the three-stage arrangement of the stirring blades is shown, but the one-stage arrangement or four or more stages may be arranged. Further, the number of stirring blades formed per stage may be, for example, three blades or four blades. The stirring blade 3
The drill bit 10 attached to a and 3b can be omitted.
【0018】本例においては、掘削土を縦方向にも剪断
するべく、前記攪拌翼3Aに対し、複数の縦剪断用補助
翼11が垂設されている。この縦剪断用補助翼11は、
剪断面を大きく確保するように下側の攪拌兼用掘削刃5
と接触しない範囲でなるだけ長くして形成するのが望ま
しい。通常、前記縦剪断用補助翼11の長さとしては、
少なくとも10cm以上、好ましくは20cm以上であるこ
とが望ましい。また、図5に示されるように、前記縦剪
断用補助翼11の回転方向側の端面11aを刃状に形成
し剪断抵抗を小さくすることが望ましい。また、前記縦
剪断用補助翼11は、図3に示されるように、平面的に
配向方向を接線方向として配置するのが望ましい。In this embodiment, a plurality of vertical shearing auxiliary wings 11 are provided to the stirring blade 3A so as to vertically shear the excavated soil. This vertical shearing auxiliary wing 11
Lower stirring / drilling blade 5 so as to secure a large shear surface
It is desirable to form it as long as possible in a range where it does not come into contact with. Usually, the length of the longitudinal shearing auxiliary wing 11 is
It is desirable that it is at least 10 cm or more, preferably 20 cm or more. As shown in FIG. 5, it is desirable that the end surface 11a on the rotation direction side of the longitudinal shearing auxiliary wing 11 is formed in a blade shape to reduce shear resistance. Further, as shown in FIG. 3, it is desirable that the longitudinal shearing auxiliary wings 11 are arranged on a plane such that the orientation direction is tangential.
【0019】なお、本実施例においては、最下段の攪拌
翼3Aに対してのみ前記縦剪断用補助翼11を設けた
が、他の攪拌翼3B、3Cに対しても設けることもでき
る。また、全攪拌翼3A〜3Cの内、任意に選定した攪
拌翼に対して設けることでもよい。In the present embodiment, the vertical shearing auxiliary blade 11 is provided only for the lowermost stirring blade 3A, but may be provided for other stirring blades 3B and 3C. Further, it may be provided for a stirring blade arbitrarily selected among all the stirring blades 3A to 3C.
【0020】以上、内管7と外管8とが正逆方向にそれ
ぞれ回転する二重管タイプの攪拌翼構造について説明し
たが、本発明は正逆回転機構を有しない単管ロッドタイ
プの攪拌翼に対しても全く同様に適用することができ
る。While the double-pipe type stirring blade structure in which the inner pipe 7 and the outer pipe 8 rotate in the forward and reverse directions has been described above, the present invention relates to a single-pipe rod-type stirring blade having no forward / reverse rotation mechanism. The same applies to wings.
【0021】次いで、前述した地盤改良装置による改良
手順について図6に基づいて説明すると、図6(A) に示
すように、攪拌ロッド1先端の掘削刃2を所定位置にセ
ットした後、パワースイベル20の駆動により攪拌ロッ
ド1を貫入させ、図6(B) に示すように、改良部の開始
位置まで空掘りする。なお、ここまでの貫入は先端の固
化材吐出口9からは固化材は吐出させずに貫入を行う。Next, the improvement procedure by the above-described ground improvement apparatus will be described with reference to FIG. 6. As shown in FIG. 6 (A), after setting the excavation blade 2 at the tip of the stirring rod 1 at a predetermined position, the power swivel The stirring rod 1 is made to penetrate by the drive of 20, and as shown in FIG. The penetration is performed without discharging the solidified material from the solidified material discharge port 9 at the tip.
【0022】次に、改良開始位置からセメント系または
石灰系の液体または粉体の固化材を内管7の吐出口9か
ら吐出させながら、先端の掘削刃2で地盤掘削を行うと
ともに、攪拌兼用掘削刃5および攪拌翼3A〜3Cによ
り掘削土と固化材との攪拌・混合を行う。この場合、攪
拌ロッド1の下降速度としては、毎分0.3〜1.0m
程度とし、ゆっくりと貫入させるのがよい。Next, while the cement-based or lime-based liquid or powder solidified material is discharged from the discharge port 9 of the inner pipe 7 from the improvement start position, the ground is excavated with the excavating blade 2 at the tip, and the agitation is also performed. The excavated soil and the solidified material are agitated and mixed by the excavating blade 5 and the stirring blades 3A to 3C. In this case, the descending speed of the stirring rod 1 is 0.3 to 1.0 m / min.
It is good to make it to the extent and let it penetrate slowly.
【0023】攪拌ロッド1が支持地盤に達したならば、
内管7および外管8の回転方向を反転切換えした後、攪
拌ロッド1を上方に引き上げる。引き上げる際にも、攪
拌兼用掘削刃5と攪拌翼3により掘削土と固化材とを攪
拌・混合しながらゆっくりと引き上げる。攪拌翼3およ
び掘削刃2の回転数は、改良する土の土質条件によって
違ってくるが、1m当りの羽根切り回数が300〜60
0回になるように設定することが望ましい。ここで、前
記羽根切り回数とは、攪拌翼3および掘削刃2の改良部
1m当りの回転数であり、攪拌翼3と掘削刃2の下降時
および上昇時の回転数をすべて合計した数値をいう。When the stirring rod 1 reaches the supporting ground,
After the rotation direction of the inner tube 7 and the outer tube 8 is switched, the stirring rod 1 is pulled up. Also at the time of lifting, the excavated soil and the solidified material are slowly pulled up while being stirred and mixed by the stirring and excavating blade 5 and the stirring blade 3. The number of rotations of the stirring blade 3 and the digging blade 2 varies depending on the soil conditions of the soil to be improved, but the number of blade cutting per meter is 300 to 60.
It is desirable to set the number to zero. Here, the blade cutting frequency is the number of revolutions per 1 m of the improved portion of the stirring blade 3 and the excavating blade 2, and is a numerical value obtained by summing all the rotating speeds of the stirring blade 3 and the excavating blade 2 at the time of descent and ascending. Say.
【0024】〔実験例1〕図1に示される本発明地盤改
良装置と図7に示される従来の地盤改良装置とを用い掘
削性能の比較試験を行った。実験は本発明地盤改良装置
および従来型地盤改良装置の場合共に、先端掘削刃の回
転径を800mmで一定とし、攪拌兼用掘削刃の回転径を
1000mm〜1700mmの範囲で4段階で変更し、対象
地盤が粘性土の場合とレキ・砂レキの場合について地盤
改良を行い、それぞれのケースについて掘削性能を評価
した。掘削性能の評価は、良好;良好な状態で掘削が
行うことができた、困難;掘削できないことはないが
施工性が低下する、不能;掘削することができない、
の3段階評価により行った。その結果を表1に示す。[Experimental Example 1] A comparison test of excavation performance was performed using the ground improvement device of the present invention shown in FIG. 1 and the conventional ground improvement device shown in FIG. In the experiment, in both the ground improvement device of the present invention and the conventional ground improvement device, the rotation diameter of the tip excavation blade was kept constant at 800 mm, and the rotation diameter of the stirring and excavation blade was changed in four steps within the range of 1000 mm to 1700 mm. The ground improvement was performed for the case where the ground was cohesive soil and the case where the ground was sandy and sandy, and the excavation performance was evaluated for each case. Evaluation of excavation performance is good; excavation was performed in good condition, difficult; excavation was not possible but workability was reduced, impossible;
The three-step evaluation was performed. Table 1 shows the results.
【0025】[0025]
【表1】 [Table 1]
【0026】表1より、明らかなように、対象地盤種が
粘性土の場合において、本発明装置の場合には回転径1
000mm〜1700mmのすべての場合に良好な掘削性能
が得られたのに対し、従来装置の場合には回転径120
0mmまでは良好な掘削性能が得られたが、これより回転
径が大きくなるに従い掘削が困難、そして不能となっ
た。As is apparent from Table 1, when the target ground type is cohesive soil, in the case of the apparatus of the present invention, the rotation diameter is 1 mm.
Good excavation performance was obtained in all cases of 000 mm to 1700 mm, whereas in the case of the conventional device, the rotation diameter was 120 mm.
Although good excavation performance was obtained up to 0 mm, excavation became difficult and impossible as the turning diameter became larger.
【0027】また、対象地盤種がレキ・砂レキの場合に
おいては、本発明装置の場合には回転径1500mmまで
良好な掘削性能が得られたのに対し、従来装置の場合に
は回転径1000mmまでしか良好な掘削性能が得られて
おらず、いずれの場合においても従来装置より本発明装
置の方が掘削性能が高いことが判明している。In the case where the target ground type is rubbed or sandy, good excavation performance was obtained up to a turning diameter of 1500 mm in the case of the apparatus of the present invention, while a turning diameter of 1000 mm was obtained in the case of the conventional apparatus. Good excavation performance was obtained only up to this point, and in any case, it has been found that the device of the present invention has higher excavation performance than the conventional device.
【0028】〔実験例2〕次いで、実験例2において
は、共に本発明を適用した、正逆回転機構の二重管式地
盤改良装置と、一方向回転機構の単管式地盤改良装置と
を用いて地盤改良を行い、所定深度3ヵ所でコアサンプ
ルを採取し一軸圧縮強度の比較を行った。前記改良条件
を表2に示し、強度試験結果を表3に示す。[Experimental Example 2] Next, in Experimental Example 2, a double-pipe ground improvement apparatus having a forward / reverse rotation mechanism and a single-pipe ground improvement apparatus having a one-way rotation mechanism to which the present invention was applied. The soil was improved by using the same, core samples were taken at three predetermined depths, and the uniaxial compressive strength was compared. The improved conditions are shown in Table 2, and the results of the strength test are shown in Table 3.
【0029】[0029]
【表2】 [Table 2]
【0030】[0030]
【表3】 [Table 3]
【0031】表2より明らかなように、単管式装置の場
合に比べて二重管式装置の場合の方が上部、中間および
下部のすべての位置において一軸圧縮強度が高くなって
いるとともに、強度のバラツキ具合をみても二重管式装
置の場合の方が格段に小さいことが判明している。As is clear from Table 2, the uniaxial compressive strength is higher in all the upper, middle and lower positions in the case of the double tube type device than in the case of the single tube type device. It has been found that the strength of the double-pipe type apparatus is much smaller than that of the strength variation.
【0032】[0032]
【発明の効果】以上詳説のとおり、本発明によれば、攪
拌ロッドの先端で掘削された掘削土を効率良く上方に掻
き上げて現位置に滞留させないため、攪拌兼用掘削刃の
回転径を大きくした場合や硬い地盤を空掘りする場合で
も高い掘削性能を維持することができるようになる。As described in detail above, according to the present invention, the excavated soil excavated at the tip of the stirring rod is efficiently lifted upward and does not stay at the current position, so that the rotating diameter of the stirring and excavating blade is increased. High excavation performance can be maintained even when drilling or when digging hard ground.
【図1】地盤改良装置の全体側面図である。FIG. 1 is an overall side view of a ground improvement device.
【図2】攪拌ロッドの先端部拡大図である。FIG. 2 is an enlarged view of a tip portion of a stirring rod.
【図3】図2のIII −III 線矢視図である。FIG. 3 is a view taken along line III-III in FIG. 2;
【図4】図2のIV−IV線矢視図である。FIG. 4 is a view taken in the direction of arrows IV-IV in FIG. 2;
【図5】他の縦剪断用攪拌翼の例を示す部分斜視図であ
る。FIG. 5 is a partial perspective view showing another example of a vertical shearing stirring blade.
【図6】地盤改良要領を示す工程順序図である。FIG. 6 is a process sequence diagram showing a ground improvement procedure.
【図7】従来の攪拌翼構造の概略図である。FIG. 7 is a schematic view of a conventional stirring blade structure.
1…攪拌ロッド、2…掘削刃、3…攪拌翼、4…先端掘
削刃、5…攪拌兼用掘削刃、6…連続刃、7…内管、8
…外管、9…固化材吐出口、10…掘削ビット、11…
縦剪断用補助翼DESCRIPTION OF SYMBOLS 1 ... stirring rod, 2 ... excavating blade, 3 ... stirring blade, 4 ... tip excavating blade, 5 ... stirring / excavating blade, 6 ... continuous blade, 7 ... inner tube, 8
... outer tube, 9 ... solidified material discharge port, 10 ... drill bit, 11 ...
Auxiliary wing for longitudinal shear
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小庄 憲弘 東京都千代田区九段北4丁目2番35号 ライト工業株式会社内 (72)発明者 内藤 真木 東京都千代田区九段北4丁目2番35号 ライト工業株式会社内 (56)参考文献 特開 平4−247117(JP,A) 特開 昭59−154214(JP,A) 特開 平5−33341(JP,A) 特開 平2−20715(JP,A) 特開 昭57−169126(JP,A) 実開 平7−29015(JP,U) 実開 平3−13325(JP,U) (58)調査した分野(Int.Cl.7,DB名) E02D 3/12 102 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Norihiro Kojo, 4-35, Kudankita, Chiyoda-ku, Tokyo Light Industry Co., Ltd. (72) Maki Naito, 4-35, Kudankita, Chiyoda-ku, Tokyo JP-A-4-247117 (JP, A) JP-A-59-154214 (JP, A) JP-A-5-33341 (JP, A) JP-A-2-20715 (JP, a) JP Akira 57-169126 (JP, a) JitsuHiraku flat 7-29015 (JP, U) JitsuHiraku flat 3-13325 (JP, U) (58 ) investigated the field (Int.Cl. 7 , DB name) E02D 3/12 102
Claims (2)
けられ、固化材と掘削土とを原位置で攪拌・混合する地
盤改良装置において、 前記攪拌ロッドを内管と外管からなる二重管構造のロッ
ド体とし、これら内管と外管とを互いに逆方向に回転さ
せるように構成し、 前記掘削刃は、攪拌ロッドの最先端部に設けられた先端
掘削刃と、この先端掘削刃よりやや基端側に離間して設
けられるとともに前記先端掘削刃の回転径以上の回転径
とされる攪拌兼用掘削刃とから構成され、 前記先端掘削刃と攪拌兼用掘削刃とがこれらを繋ぐ螺旋
状の連続刃によって連続一体化されており、 前記外管の先端付近の外周に対称的に設けられた一対の
攪拌翼を設け、この攪拌翼に下方に延び前記攪拌兼用掘
削刃と接触しない範囲で長い縦剪断用補助翼を設けたこ
とを特徴とする地盤改良装置。1. A ground improvement device in which an excavating blade and an agitating blade are provided at the tip of an agitating rod, and a solidified material and an excavated soil are agitated and mixed in situ, wherein the agitating rod comprises an inner tube and an outer tube. The inner pipe and the outer pipe are configured to rotate in opposite directions to each other with a rod body having a double pipe structure, and the excavating blade includes a tip excavating blade provided at a foremost portion of a stirring rod, The agitation / drilling blade is provided at a distance slightly closer to the base end than the digging blade and has a rotation diameter equal to or larger than the rotation diameter of the tip digging blade. A pair of agitating blades symmetrically provided on the outer periphery near the tip of the outer tube, and a pair of agitating blades extending downwardly to the agitating blades are provided. setting a long vertical shearing ailerons in a range that does not contact with the digging edge Soil improvement and wherein the a.
に設けられた左側掘削刃と右側掘削刃とからなる先端掘
削刃と、この先端掘削刃よりやや基端側に離間した位置
に前記左および右側掘削刃と平面的に略90°のずれを
もってロッドを中心として対称的に設けられた左側攪拌
兼用掘削刃と右側攪拌兼用掘削刃とからなるとともに、
前記先端掘削刃の回転径以上の回転径とされる攪拌兼用
掘削刃とから構成され、 前記先端掘削刃と前記攪拌兼用掘削刃とは、前記左側掘
削刃の上端辺から前記左側攪拌兼用掘削刃の内側下端辺
までを螺旋状に連続させる左側連続刃と、前記右側掘削
刃の上端辺から前記右側攪拌兼用掘削刃の内側下端辺ま
でを螺旋状に連続させる右側連続刃とによって連続一体
化されている請求項1記載の地盤改良装置。2. The excavating blade according to claim 1, wherein the excavating blade includes a left excavating blade and a right excavating blade which are provided symmetrically with respect to a rod, and a position slightly away from the distal excavating blade to a base end side. The left and right excavation blades are composed of a left agitating and excavating blade and a right agitating and excavating blade that are provided symmetrically about the rod with a deviation of about 90 ° in plan from the rod,
The tip excavation blade is configured to have a rotation diameter equal to or larger than the rotation diameter of the tip excavation blade, and the tip excavation blade and the stirring / excavation blade are the left stirring / excavation blade from the upper edge of the left excavation blade. And a right continuous blade that spirally continues from the upper edge of the right digging blade to the inner lower edge of the right stirring and digging blade. The ground improvement apparatus according to claim 1, wherein
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP04202995A JP3209873B2 (en) | 1994-11-21 | 1995-03-01 | Ground improvement equipment |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP28671594 | 1994-11-21 | ||
JP6-286715 | 1994-11-21 | ||
JP04202995A JP3209873B2 (en) | 1994-11-21 | 1995-03-01 | Ground improvement equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH08199557A JPH08199557A (en) | 1996-08-06 |
JP3209873B2 true JP3209873B2 (en) | 2001-09-17 |
Family
ID=26381675
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP04202995A Expired - Lifetime JP3209873B2 (en) | 1994-11-21 | 1995-03-01 | Ground improvement equipment |
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Country | Link |
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JP (1) | JP3209873B2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4401675B2 (en) * | 2003-04-18 | 2010-01-20 | エコシステムエンジニアリング株式会社 | In-situ purification equipment for soil or groundwater contamination |
JP5069817B2 (en) * | 2008-09-12 | 2012-11-07 | 株式会社新生工務 | Ground improvement method and ground improvement device |
JP6646642B2 (en) * | 2017-11-27 | 2020-02-14 | 昌尚 橋本 | Manufacturing method of improved body |
JP6710807B2 (en) * | 2019-12-15 | 2020-06-17 | 昌尚 橋本 | Method of manufacturing improved body |
-
1995
- 1995-03-01 JP JP04202995A patent/JP3209873B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH08199557A (en) | 1996-08-06 |
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